Added entry for: XVisualInfo *vi to XwDev struct, and prototype for new global function PLX_save_colormap.
Added entry for: XVisualInfo *vi to XwDev struct, and prototype for new
global function PLX_save_colormap.

svn path=/trunk/; revision=844

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot